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Posted to issues@spark.apache.org by "Zhenhua Wang (JIRA)" <ji...@apache.org> on 2017/01/18 08:09:26 UTC
[jira] [Created] (SPARK-19271) Non-cbo estimation of aggregate
Zhenhua Wang created SPARK-19271:
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Summary: Non-cbo estimation of aggregate
Key: SPARK-19271
URL: https://issues.apache.org/jira/browse/SPARK-19271
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Zhenhua Wang
Change non-cbo estimation behavior of aggregate:
If groupExpression is empty, we can know row count (=1) and the corresponding size;
otherwise, estimation falls back to UnaryNode's computeStats method, which should not propagate rowCount and attributeStats in Statistics because they are not estimated in that method.
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